package com.sun.operator;

public class Demo07 {
    public static void main(String[] args) {
        int a = 10;
        int b = 20;

        a+=b;// a = a+b
        a-=b;// a = a-b

        System.out.println(a);

        //字符串连接符  + , String
        System.out.println(""+a+b);
        System.out.println(a+b+"");

    }
}
